Error No object hash found, while object with id 'xxx' was part of the incoming objects.

Yesterday migrated to 7.3 ( from 6.10.7 ). In runtime I created a record (via MicroFlow) open the page with the new added record. Fill in the page and now after Save button ( MF ) and cancel button ( no MF ) this error occur.

com.mendix.webui.WebUIException: No object hash found, while object with id '31243722414886117' was part of the incoming objects.
at com.mendix.webui.requesthandling.HashUtil$.verifyHash(HashUtil.scala:60)

PopDialog couldn't be closed anymore so kill Mendix session